406 , THE PLUM WART. 



forests were cleared away, and when the seasons 

 were more equable, it was not troublesome ; and 

 now, in many new countries the plum can be raised 

 with ease previous to the clearing which precedes 

 a growing population. But he overlooks the fact 

 that, if such be the cause, it should be more preva- 

 lent in the interior districts, and less so on the coast, 

 where the ocean tends to equalize the temperature. 

 But this is not sustained by experience. 



2. Gumming — Apostaxis. Page 491. 



IV. Diseases affecting the Tree generally. 

 1. Profusion of Sap — Profusio simplex. Page 462. 



2. Vitiation of the Sap — Veneficium,. Page 476. 



3. Freezing — Congelatio. Page 469. 



4. Dropsy — Anasarca. Page 473. 



5. Wounds — Vuhiera. Page 474. 



§ VI. — diseases of the cherry. 



I. Diseases affecting the Leaf. 1. Insects. (1) 

 Cherry-tree Douse — Aphis cerasi : Fabr. This is 

 wonderfully reproductive. It makes its appearance 

 from the fifteenth to the twenty-fifth of June, when 



